洗垂辈晒雇臂炬筏陵舜辟角逼
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起止时间:2020-03-16到2020-08-31
更新状态:已完结
第二章 基本概念 第二章测试
1、 Which of the following is a germ cell?
A:cells of the gonads
B:intestinal cells
C:sperm and eggs
D:zygotes
答案: sperm and eggs
2、 Which of the following basic developmental processes is most dependent on cellular movements?
A:cell differentiation
B:growth
C:morphogenesis
D:pattern formation
答案: morphogenesis
3、 A morphogen is
A:a cell or group of cells that signal other cells to become determined in a specific way
B:a gene that causes a cell or group of cells to adopt a particular shape
C:a signaling molecule that causes the differentiation of neighboring cells
D:a signaling molecule that confers concentration-dependent positional information
答案: a signaling molecule that confers concentration-dependent positional information
4、 What distinguishes stem cells from other cell types?
A:Although all cell types can divide, only stem cells differentiate after division.
B:Stem cells are able to divide to produce populations of cells that differentiate into a related set of cells.
C:Stem cells divide asymmetrically to give rise to one daughter cell that remains a stem cell, and a second daughter cell that differentiates into one or more cell types.
D:Stem cells have a special type of cell division in which they form small stems that then pinch off to give rise to the daughter cell.
答案: Stem cells divide asymmetrically to give rise to one daughter cell that remains a stem cell, and a second daughter cell that differentiates into one or more cell types.
第三章 脊椎动物生命周期和发育概要 第三章测试
1、 Which of the following is a vertebrate ‘model organism’ used in the study of development?
A:Drosophila melanogaster
B:Homo sapiens
C:Caenorhabditis elegans
D:Xenopus laevis
答案: Xenopus laevis
2、 The nervous system, heart, and liver are derived from ( ), ( ), and ( ), respectively.
A:all are derived from mesoderm
B:ectoderm, mesoderm, and endoderm
C:endoderm, mesoderm, and ectoderm
D:mesoderm, ectoderm, and endoderm
答案: ectoderm, mesoderm, and endoderm
第四章 体轴建立 第四章测试
1、 The ‘organizer’ in Xenopus is responsible for
A:inducing a mesodermal fate in nearby cells
B:helping to pattern the mesoderm along the dorso-ventral axis
C:specifying the dorsal region of the embryo
D:all of these events
答案: helping to pattern the mesoderm along the dorso-ventral axis
2、 A key factor that specifies the organizer in Xenopus embryos is:
A:GSK-3β
B:Fz7
C:Wnt-11
D:β-catenin
答案: β-catenin
3、 Maternal factors are
A:the energy-rich yolk present in the eggs of many species
B:the genes contributed to the embryo by the maternal haploid genome
C:the genes expressed by the zygotic genome in the egg
D:developmentally active mRNAs and proteins packaged into the egg by the mother
答案: developmentally active mRNAs and proteins packaged into the egg by the mother
4、 The positioning of the dorso-ventral axis in Xenopus is deter mined by ( ), while the positioning of the antero-posterior axis in chicks is deternined by ( ).
A:gravity; point of sperm entry
B:maternal factors in both cases
C:position in the egg chamber; gravity
D:the point of sperm entry; gravity
答案: the point of sperm entry; gravity
第五章 胚层来源和特化 第五章测试
1、 If cells from the animal pole of a Xenopus blastula (animal cap cells) are placed in direct contact with cells from the vegetal region, what is the result?
A:An embryo forms with only ectodermal and endodermal derivatives.
B:Animal cap cells are induced by the vegetal cells to form meso dermal derivatives.
C:The embryo regulates and forms a normal embryo.
D:Vegetal hemisphere cells are induced by the animal cap cells to form mesodermal derivatives.
答案: Animal cap cells are induced by the vegetal cells to form meso dermal derivatives.
2、 Vg-1, Nodals, BMPs and activin are all members of which family of signaling molecules?
A:FGF
B:Hedgehog
C:TGF-β
D:Wnt
答案: TGF-β
3、 The Brachury protein is
A:an early marker of the mesoderm
B:an early marker of the endoderm
C:expressed throughout the ectoderm
D:only expressed after gastrulation
答案: an early marker of the mesoderm
4、 Endoderm and mesoderm are specified in the zebrafish blastoderm by
A:signals from the shield region
B:maternal signaling molecules laid down in the egg
C:a gradient of β-catenin signaling
D:a gradient of Nodal signaling
答案: a gradient of Nodal signaling
第六章 体节 第六章测试
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